1. What an OE number is
OE stands for Original Equipment. The OE number is the part number the vehicle manufacturer assigns to a component in its own parts catalogue. Every part on a new car has one: the cabin filter in a Mercedes-Benz C-Class, for example, is catalogued as A 202 830 00 18. The number is printed on the original part and listed in the manufacturer's dealer catalogue under your VIN.
An OE number identifies a part precisely, independent of brand. It does not change when a supplier changes, and it is the same across all markets where the car is sold. That makes it the most reliable key for finding a replacement: if a replacement part is cross-referenced to your OE number, it fits the same position on the same car.
2. OE number vs aftermarket part number
Independent manufacturers such as Bosch, Mann-Filter or Mahle sell parts for the same position under their own numbers. The Bosch cabin filter 1 987 432 001 is one of several aftermarket parts cross-referenced to the Mercedes-Benz OE number above. One OE number usually maps to many aftermarket numbers; one aftermarket number can map to several OE numbers when it fits more than one car.
| OE number | Aftermarket part number | |
|---|---|---|
| Who assigns it | The vehicle manufacturer (Audi, Mercedes-Benz, Volvo…) | The parts manufacturer (Bosch, Mann, Mahle, TRW…) |
| Example | A 202 830 00 18 | Bosch 1 987 432 001 |
| Where you find it | On the original part, in the dealer catalogue by VIN, on dealer invoices | On the replacement part and its box, in the manufacturer's catalogue |
| What it tells you | Exactly which position and version of the part your car uses | Which product it is; fitment comes from the cross-reference to OE numbers |
| Quality class on PartStall | OE (sold by the vehicle brand) | Economy · Standard · Premium, depending on the parts manufacturer |
Price and quality differ by class, not by the number. An Economy and a Premium filter can both be cross-referenced to the same OE number and both fit; the difference is in materials, filtration grade and warranty terms.
3. Where to find the OE number for your car
There are four reliable places. The original part itself: most components carry the number stamped or printed on them. Dealer paperwork: service invoices and the original parts list name the OE number for each line. The dealer: with your VIN, any brand dealer can look it up in the manufacturer's catalogue. And the product page on PartStall: once you have selected your car by plate number or VIN, every product shows its OE references under "OE numbers".
OE number stamped on a cabin filter housing; the box lists the cross-referenced aftermarket number.
4. How to search with an OE number on PartStall
Type or paste the number into the search field at the top of any page. Spaces, dots and dashes do not matter: A2028300018 and A 202 830 00 18 give the same result, because we normalise every number to letters and digits before matching. The search looks through article numbers, trade numbers, OE references, EAN codes and replacement lists at the same time.
- An exact article match opens the product page directly.
- An OE match opens the list of all replacements for that OE number, each with its quality class, price incl. VAT and delivery date.
- Several matches open the search results, where you can filter by brand, class and stock.
Select your car first. With the car known we mark every result "Fits your car" or "Does not fit your car" using the manufacturer's fitment data, and we show the engine code the part is listed for. If a part is listed for your model but your engine or equipment differs, send us your VIN and we check it before you order.
Still unsure which replacement to pick? Order the Standard class if you want the same level as the factory part at a lower price, Premium if the car is under extended warranty or driven hard, and OE if you need the original brand for a lease return or a warranty claim.
